The ruins of an ancient Martian civilization have unlocked the secrets to teleportation, and the UAC will stop at nothing to harness this world-altering technology. As part of a marine detachment sent to protect the facility, your duty seemed simple enough…until the invasion.

Download the DOOM 3 demo to begin your assignment at the UAC Mars research facility. Explore and battle through the first chapter. Includes 3 levels.

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it is a great demo (for all that demos are worth). But the reason I voted 3 is because There is no sound at all in the demo.

Kooper(9/21/2009 - version 1.0)

The most evil game I've ever played (for a short time on the demo) Check out the youtube video "Doom 3 Birth control".
The game's icon should be the most clear
give away - It's a pentagram - A devil's symbol.

unt(8/25/2009 - version 1.0)

This game is freakin intense. Graphics, character and story are great. The audio doesn't work on my MacBook unless you wear headphones or plug in speakers. Slow level loading though and slow framerate. But it's worth it! This game scared the f*** out of me!! Play at your own risk, for you control the one man who stands between Hell and Earth...